Anthony Liguori wrote:
With the default options, my idle winxp guest causes about 550
wakeups/sec which is pretty close to what I'd expect. I don't think
you'll get much better than that without using a dynticks guest.
According to powertop, I had about 15 kvm wakeups/sec with my previous
setup (nohz, no display). Now I upgraded to kvm-70 and the timer
interrupt has reappeared so I have this:
Top causes for wakeups:
25,4% (112,4) <kernel IPI> : function call interrupts
22,6% (100,0) qemu-system-x86 : kvm_arch_vcpu_ioctl_run (pit_timer_fn)
22,6% (100,0) qemu-system-x86 : __kvm_migrate_timers (apic_timer_fn)
8,7% ( 38,5) qemu-system-x86 : sys_timer_settime (posix_timer_fn)
What could be the cause for this change? The previous kvm was from
Ubuntu 8.04, there are no changes in the guest.
In general, what are the best host/guest settings for a low number of
wakeups?
Thanks,
Anders.
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